Allstar ALL96490 1-3/4" Maximum Spring Diameter 1200 lbs Rating C-Clamp Style Engine Valve Spring Compressor Engine valve spring compressor is a c-clamp style and is for use with a 1-3/4 inch maximum spring diameter Compressor will fit most heads including the hemi and will handle spring pressures in excess of 1200 pounds. Without slipping off Spring cup will fit stock springs up to 1.750 inch diameter and have a working window for access to keepers that measure 1.100 inch, too large for some small diameter spring/retainer combinations Compressor has 9/16 inch hex for use with a wrench, ratchet or impact Sold each